Thermal and Ru-catalyzed Reactions of Styryl-Substituted Azulenes with Dimethyl Acetylenedicarboxylate
作者:Anne Andr�e Sophie Briquet、Hans-J�rgen Hansen
DOI:10.1002/hlca.19940770723
日期:1994.11.2
are formed, the corresponding benzanellated azulene trans-29 ist found to be the second main product (21 and 10%, respectively) under both reaction conditions. The thermal reaction yields also the benzanellated azulene 28 which is not found in the catalyzed variant of the reaction. Heptalene-1,2-dicarboxylates are also formed from 4-[(E)-styryl]azulenes (e.g. (E)-33 and (E)-34; Scheme 14) and ADM at